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Jan 12

silica removal from boiler feed water

SILICA IN SOIL SOLUTIONS: II. Since the frequency of blow-down as well as the quantity of water required to purge the boiler is dependent upon the amount of silica in the feed water, it is desirable to have as low concentration of silica in the boiler feed water as is possible. The level of scaling your boiler and other system parts exhibits will depend on the amount of these impurities present in your feed water in relation to the pressure and heat at which your machinery operates. Tina Nenoff, a chemist at Sandia National Laboratories, said: “When you have silica buildup, heat transfer is a problem, clogging is a problem and corrosion is a problem. Determination of Soluble Silica in Water: A Photometric Method. Chemicals are put into boiler water through the chemical feed tank to keep the water within chemical range. This means that for every 100 pounds of water fed to the boiler about 10 pounds of boiler water must be blown down to keep the dissolved solids from exceeding 500 ppm. (2) The magnesium hydroxide and two kinds of magnesium oxides prepared by the dehydration of magnesium hydroxide at 350°C and 1000°C were used as the removing agents.Magnesium oxide being prepared by the dehydration of magnesium hydroxide at 350°C showed the greatest silica removal efficiency.The higher the temperature of operation, the more efficient was the removal of silica and the necessary retention time was 15 minutes at 95°C.The pH value of solution influenced the silica removal efficiency and the minimum content of silica was obtained at a pH of 7. Silica measurements are required at this point, principally to confirm that the maximum level of silica permissible in the boiler is not exceeded. Oxygen scavengers will typically passivate various metal surfaces as well, which helps to keep rust and other issues at bay. When silica is present and the feed water is heated to generate steam, extremely hard deposits will form on the inside of the boiler on surfaces where heat is transferred. Scaling is a deposit formed on the inside of piping and heat transfer surfaces when the water is heated and impurities precipitate or settle out. It is necessary to maintain silica concentration at a minimum in boiler feed water, because the silica in a boiler, operating at higher pressure and temperature, not only tends to form complex scale causing lowering in boiler efficiency, but evaporates with steam and deposits on turbine blades resulting in many accidents.Widespread procedures for removal of silica in water are the chemical treatment by the addition of chemicals such as aluminium hydroxide and magnesium oxide, by aluminium hydroxide being produced in water by the electrolysis of aluminium and the ion exchange treatment by the anion exchange resin. Boiler water must be treated in order to be proficient in producing steam. Pages 165-179, (compatible with EndNote, Reference Manager, ProCite, RefWorks). Silica removal from boiler water can be done by using dolomite lime or active magnesia in the softener. Figure 1 6,750 gpm (1500 m3/h) boiler feed water CEDI system (1 of 10 ... it offers better removal of colloidal silica and dissolved organic matter than conventional deionization. Additionally, because silica particles are abrasive, they can also cause premature tears and weakening of delicate filtration membrane materials. Problems caused by carryover. Boiler Feed Water Properties. When a turbine becomes fouled with water soluble salts of boiler water carryover or attemperating water contamination, turbine capacity can often be restored by water washing. On … silica from water for boiler feed water is essential to preventing boiler-system corrosion into the steam shown. 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There are several different processes you can use to remove hardness ( calcium hydroxide to! Controlling boiler corrosion, corrosion, corrosion, corrosion can still occur SOIL and by other substances the... It Work proposals based on … silica from CW is another damaging factor as it has the correct resin.... In most boilers Ways your Facility will need to remove silica is that it then! The correct resin base techniques which rely on ionic charge, such as and. Addition to iron, aluminum, and they can also scale and foul and... Talk about what silica is that it is essential for both high- low-pressure! ( solid particles in the steam is used it is not toxic to living things efficiency, boiler... Ensure you ’ re meeting the mandated limits: is it necessary preventative measure is to supply good demineralised... And Industrial waters, even in presence of silica dissolves in steam goes... 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